Governing mechanism for engines.



No. 823,567. PATENTED JUNE 19, 1906. W. L. WATERS.

GOVERNING MECHANISM FOR ENGINES. APPLIIOATION rum) M10. 5-, 1904.

. 3 g jNllliam L waTers ANDREW B. GRAHAM 00.. rnoTo-umoemmms. wAsmNm'oN,ll 6.

UN TEDSTAT S PAT NT. .QFEIOE WILLIAM? L. WATERS; on MILWAUKEE,-wrsconsnv.

GOVERNING-MECHANISM FOR ENGINES.

' Specification of Letters Patent. Application filed December 5, E1904.Serial No. 235.468.

Eatented June 19, 1906.

to the accompanying drawings, forming a part of this specification.

My invention relates to governors and gov- 1 erning mechanism forengines; and its object is to provide improved dash-pot mechanism forcontrolling the'action of the engine-governor.

' It is very desirable in some classes of work to retard, or dampen theaction of the governor to cause -more gradual control of thesteam-supply, and this is usuallyaccomplished by associating a dash-potwith-the supply-valve stemor with someother part of By myimproved formof dash-pot mechaning of the governor action.

damping is considerable and the engine-is.

the governor. The dash+pot is usually provided with a bypass adapted tobe adjusted to allow any degree of retardation ordamp- Where .this

driving a heavy load there will be atendency for the engine to race-asthe load is suddenly taken therefrom, owing to the inability'of thegovernor when thus damped to quickly control the valve ,to shut off thesteam-supply.

ism I am enabled to overcome this disadvantage, and I employ anadditional passageway or valve by means of which the piston in thedash-pot will be allowed to move unimpeded upon a sudden tendency'of thegovernor to. effect closure of the supply-valve asthe load on the engineis suddenlydiminished. I i I My invention will be. bestunderstood withreference to the accompanying drawings, in which I r Figure 1 is anelevation view of an engine,

showing the dash-pot mechanism associated with the governor. Fig. 2 is aplan viewCof the dash-pot mechanism,-v the cover thereof being removedand other; partsfibeing cut away to show valve construction; and Fig. 3is a longitudinal sectional view taken on line 33ofFig. 2.

The engine consists of a cylinder 1, the piston of which is suitablyconnected in driving relation with the shaft 2, carrying the flywheel 3and driving-wheel 4;. The controlwith a chamber 25. 'over the, top edgeof the outer vessel andhas a bushing27, through-which passes thepiston-rod 17, connected with the piston-head lling vsupply-valve 5.forrthe engineisinterposed between the cylinder 1 and the pi ing 6leading to a source of steam-supply. Not shown.) .Thevalve-stem-7 of thecontrolling. valve extendsupwardly through a collar 8, said collar.having no vertical motion. bevel-gear 9, secured to the collar, mesheswith a bevel-gear 10, which is driven by .means of a belt 11, suitablyconnected with :the main shaft 2, and thus as the engine opthereofdepending upon the speedy of the en- ;gine. As the sleeve 8. rotates thecentrifu- Zgal force will throw the balls 14 outwardly a gdistancedepending upon the speed of the en- Zgine and the valve-stem 7 will bemoved ac- ;cordingly to open or close to any degree the ipassage-waythrough the main valve.5,. the {outward motion of the valve-spindleserving ;to close the valve and the downward motion serving to open thevalve. 'tion-of the governor and valve-stem, a dash- .pot 16 is used,whose piston-rod 17 is connected to the valve-stem 7 by an arm 18. Thedash-p ot is filled with oil or other viscous substance 19, and aby-pass 20, leading into the 1 gupper and lower ends of the dash- 0t, isproivided with a-valve 21 by means 0 which the passage-way through theby-pass may be ad- :justed, and thereby to cause any degree ofretardation or damping of the governor and :main valve connectedtherewith. Under normal conditions the by-pass wil afford suflicientpassage-way of, the oilor other substance; but upon a sudden diminutionofthe load on the engine the'by-pass will be insufiicient to allowsuflicient rapidity of motion ofthepisto'n-head 22 within the dash-potto shutoff-the steam-supply in time to prevent undue speedor racing ofthe engine. To overcome this difficulty, I

' construct the dash-pot mechanism as shown in detailin- Figs. 2 and 3,and thedash-pot consists of an inner vessel 23, which forms thedash-potproper, and an outer vessel 24,.

surrounding the innervessel toform there- A cover 26 engagesv erates thesleeves 8 willbe rotated, the speed To retard the ac- 22. Both vesselsare filled with oil or other viscous substance 19, and the by-pass 20connects the upper end with the outer end of the inner vessel to allowpassage-way of the oil in either direction as the piston or plungermoves up or down within the vessel. The

valve 21 in the by-pass controls the passageway therethrough, and thusany degree of retardation may be ofiered the plunger and the governormechanism connected therewith.

The dash-pot mechanism thus far described is the arrangement usuallyheretofore employed; but this arrangement will prevent sufficientlyrapid response of the governor mechanism to actuate the valve mechanismto prevent racing of the engine should its load suddenly be diminished.I therefore introduce an additional passage-way 28 in the lower part ofthe inner vessel, preferably in the bottom wall thereof, as shown, andthis opening is controlled by a checkvalve 29, whose stem 30 passesupwardly through the guiding-bridge 31. This checkvalve preventspassage-way of oil through the opening 28 from the inner to the outervessel, but will allow passage in the opposite direction. Upon thetendency of the engine to unduly and suddenly increase in speed therewill be a tendency of the governor-balls to suddenly fly outwardly topull the valve-stem to close the main supplyvalve, and thus to preventracing. Owing to the damping effect of the dash-pot, however, thegovernor would not respond quickly enough to prevent such racing ifitwere not for the passage-way 28. Upon tendency of the governor-balls tosuddenly pull the valvestem and plunger 22 upwardly the checkvalve 29will be raised and the oil from the vessel 24 may readily pass into theinner vessel 23 and allow unimpeded upward passage therein of theplunger and the valvestem connected therewith, and the main supply ofsteam can be shut off in time to prevent racing of the engine. The oilsuddenly carried upwardly by the plunger will be returned to the vessel24 through the overflow-opening 32, and the by-pass will carry part ofthis oil to the lower part of the inner vessel. When the speed of theengine has again become normal, the oil will readily be carried by theby-pass and the governor damped as before, the check-valve 29 beingactuated only upon sudden upper movement of the plunger.

I have thus provided improved dash-pot mechanism which under normalconditions may be adjusted for any degree of damping, so that theretardation of the governor will be sufliciently gradual to preventsudden tendencies of the engine to drop in speed, while at the same timeupon a sudden impulse of the engine to unduly increase in speed thedash-pot arrangement will allow the governor to act rapidly to reducethe steam-supply.

I do not wish to be limited to the exact construction and arrangement ofthe parts as shown, as modifications may readily be made withoutdeparting from the spirit of invention.

I claim as new, however, and desire to secure by Letters Patent 1. In adash-pot mechanism for enginegovernors, the combination with an outerand inner vessel, of a plunger adapted to reciprocate within the innervessel, an adjustable by-pass connecting the upper and lower ends ofsaid inner vessel, and a valve in the lower part of said vessel adaptedto prevent communication between the vessels during one direction ofmovement of the piston and adapted to open communication between thevessels during the opposite direction of motion of the piston.

2. In a dash-pot mechanism for enginegovernors, the combination with aninner and outer vessel having communication at their upper end and bothfilled with fluid, of a piston for reciprocating within the innervessel, an adjustable by-pass connecting the upper with the lower partof the inner vessel, and a check-valve in the base-wall of the innervessel adapted to prevent communication between the inner and outervessels upon downward stroke of the piston and. to allow communicationbetween the vessels upon upward stroke of the piston.

3. In a dash-pot mechanism for enginegovernors, the combination with aninner and outer vessel having communication at their upper end and bothfilled with fluid, of a piston for reciprocating within the innervessel, an adjustable by-pass connecting the upper with the lower partof the inner vessel, and a check-valve in the base-wall of the innervessel adapted to prevent communica-'

